Casein glue



Patented Oct. 26,1926.

UNITED STATES (PATENT "OFFICE;

casnm GLUE.

Drawing.

Mypresent invention provides a new composition of matter herein designad" as casein glue, but which from its broa er aspect is an adhesive composition adapted for a use, by itself or commingled with other substances, as an adhesive coating. 1

In this improved adhesive composition, casein is used as an adhesive base and is commingled with dextrine, sodium aluminate,

calcium tannate, sodium fluoride, calcium chloride, and sodium formate.

lent solvent of casein of the'hydrochloric acid type, and will, when properly asso ciated, result in very cheap but very efi'ective adhesive for many uses, and especially for use in veneering wood.

I have obtained a very cheap and highly 'eflicient glue of the above noted character by the use of the above noted substances in accordance with the following' formula:

Parts Casein 50 to 75 Dextrilie 5 to 20 Sodium Illuminate .,u 3 to 15 Calcium tannate-.. 2 to 1 8 Sodium fluoride 3 to 10 Calcium chloride 2; to 6 sodiumi ormate u L to 3 V The above noted substances; are loommingled in dry or powdered form and are sold in that condition. When theadhesive is to be used, the composition is introduced into water to form anemulsion, and it is then,"of course,-thatthe chemicalreactions that develop the adhesive qualities of the water, will be required.v The abovemoted elements, form an excel- Application filed April 17, 1922. Serial 1T0. 554,201.

' composit ion,willrtakeplace; After these reactions have taken place, the emulsion is adapted to be usedas a glue or as a coating, ,or to be commingled with other substances v such/"as paint or calcimine, which contain color pigments. When desired, however, the

1 colon-producing pigments may be commingled with the dry'cpmposition. When the composition is used simply as a glue, no additions to the formula abovegiven, except Casein and dextrine both have adhesive qualities in 'the' form of colloids. The col-.- loidal properties are brought out' in a solution of sodium aluminate, sodium fluoride, and calcium chloride, in contact with hot water. Sodium formate is added for the pur pose of preventingdecomposition, the for mate having great antiseptic qualities. 0211- cium tannate is added in this instance to give increased body to the glue mixture, taking the place of the filler.

- What I claim is:

An adhesive composition made ln-accord- W ance with the followingvformulaz p Parts. Casein .i... 50 to 75 Dextrine 5 to 20 Sodium aluminate 3 to 15 Calcium tannate; 2 to 8 Sodium fluoride.- 3 to 10? Calcium chloride 2 to 6 ,Sodium'formatem to; 3

ture.

' HENRY PRESTHOLDT. 

